For the odd parity ground state, the Berry curvature \(\Omega (k)\)  is plotted in Fig. REF (b) for \(N=16\) 
with a stacking fault at the center \((m,n) = (8,8)\) . This plot can be interpreted as the superposition of contributions from two identical sections of RMG summing to give a single peak. By contrast, Fig. REF (c) shows \(\Omega (k)\)  for the odd parity ground state with the stacking fault off-center \((m,n) = (12,4)\) . In this case, there are two separate peaks corresponding to the sections of length \(m=12\)  and \(n=4\) . For both of these cases, the Berry curvature \(\Omega (k)\)  sums to give a Chern number of magnitude \(N/2\)  [1]}, [2]}, [3]}.
As a further interesting example, Fig. REF (d) shows \(\Omega (k)\)  for the same system in an even parity state [the exchange has relative signs of (-,+,+,-) on the four low-energy orbitals (\(A_1\) , \(B_m\) , \(A_{m+1}\) , \(B_N\) )] which is not the ground state. In this case, the contributions of the two sections of length \(m=12\)  and \(n=4\)  appear with an opposite sign and the Berry curvature \(\Omega (k)\)  sums to give a Chern number of magnitude \(|m-n|/2\) , i.e. it depends on the position of the stacking fault.
